﻿<!DOCTYPE html>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>签定义命令按钮，比如单选按钮、复选框或按钮。</title>
</head>
<body>
    <menu>
        <command onclick="alert('Hello World')"/>
        Click Me!
    </menu>
</body>
</html>